During the Beta they actually had a character that did travel around with her trusty dog. She was based on an actuall person who traveled around the US with her dog. Anet even had her come to there office and play the game before they even went to beta. That's when they showed her her character in the game. Not sure if she is still in the game or where to find her. I'm sure she is still in the game but I would assume she still is.

Has anyone seen her roaming around?

she doesn't roam around, she's always in the black citadel, never moves an inch